Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 15
12 GILBERT BOY ENGINEERING … compared to the size of the hole theyoverlap and produce a round image. Repeat with a square hole one-quarter inch on each side. Are the re-sults similar? You have probably noticed that sun-light produces round images of the sunwhen it passes through any small open-ing; for example, in a shutter or…
Light · Scientific recreations
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